> For the complete documentation index, see [llms.txt](https://docs.voipnumber.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.voipnumber.net/videos/pbx.md).

# PBX

VoIP Number has a range of common PBX features. You can embed them into your [Call Flow](/components/call-flow.md) using [Call Flow Builder](/features/call-flow-builder.md).

Here you will find a couple of demos showing some of them.

## Ring Group

With [Call Flow Builder](/features/call-flow-builder.md#action-ring-group) you can ring multiple extensions (in *sequential* mode - one after another, or in *parallel* - all at once, simultaneously).

{% embed url="<https://youtu.be/CnLA1FiS8rg?si=8f0u4YX8_7iQuwj4>" %}

## Conference

With [Call Flow Builder](/features/call-flow-builder.md#action-conference) you can bring multiple participants together in a single call, just like on Google Meet, Microsoft Teams or Zoom.

{% embed url="<https://youtu.be/JL_gJLq5Es0>" %}


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.voipnumber.net/videos/pbx.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.